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Dracom Commercial Video Modulator Channels 2 through 36 Channels 37 through 78

300VMFa
Dracom Commercial Video Modulator.
Channels 2 through 36, Price: $116.00
Channels 37 through 78, Price: $176.00
When ordering, please designate a single specific channel from CATV 2 to 78.
The 300VMF-a fixed channel video modulator is a quality vestigial sideband heterodyne audio/video modulator that provides a modulated visual and aural RF carrier output on any single channel up to CATV 78. The 300VMFa is designed to accept video and audio baseband signals from a satellite receiver, TV camera, or any compatible input.
Heterodyne conversion system, in conjunction with the use of a SAW filter, insures optimum vestigial selectivity for adjacent channel headends. Accepts standard video at 0.7 to 1.5 Vpp level. All level controls are located on the front panel. High output power to +55 dBmV. A convenient monitor port is provided. All aeronautical channels are offset positive with a tolerance of ± 5 kHz as required by FCC rules.
See the Instruction manual 554KB.

Dracom 300VMF-a Technical Specifications

RF
Frequency Range:	54 through 300 MHz.
Channels Available:	VHF 2 through 13 Midband 14 through 22 (A-l) and 95 through 99 (A5-A1) Superband 23-36 (J-W)
FCC Frequency Offsets:	All aeronautical channels offset positive with a tolerance of ±5 kHz.
Output Level:	+55 dBmV minimum, (typically adjustable from +40 to +55 dBmV).
Output Impedance:	75 Ohms; return loss of 14 dB.
A/V Ratio:	Audio Carrier -20 to -10 dB referenced to video carrier, adjustable.
Frequency Stability, Visual:	Within ± 10 kHz of assigned channel frequency. Within ±5 kHz of assigned channel frequency on FCC offset channels.
Aural Intercarrier Frequency:	4.5 MHz, ± 5 kHz.
Spurious Outputs:	-60 dBc minimum, measured at -15 dB A/V ratio and with modulator output level of + 55 dBmV.
In-Channel C/N:	-60 dBc.
Broadband Noise:	-80 dBc @ ± 30 MHz or greater spacing. (Specified levels are referenced to the video carrier and measured in a 4 MHz bandwidth.)
Video
Input level for 87.5%:	1 Vpp± 3 dB, manual gain adjust with front panel control.
Input Impedance:	75 Ohms, return loss of 18 dB minimum.
Frequency Response:	Flat ± 2 dB from 30 Hz to 4.2 MHz.
Video S/N:	60 dB minimum, luminance weighted.
L/C Delay:	Within 50 nanoseconds of 0 nanoseconds L/C delay (complies with FCC rule 76.605).
Differential Gain:	Less than ± 5% (10 to 90% APL).
Differential Phase:	Standard: Less than ± 5 degrees (10 to 90% APL). By special order: Less than ± 3 degrees (10 to 90% APL).
Audio
Input Level for 25 kHz Peak Deviation:	140 mV minimum. Manual gain adjustment with front panel control.
Input Impedance:	10K Ohms, unbalanced.
Pre-emphasis:	75 m Sec.
Frequency Response:	20 Hz to 15 kHz, +1, -3 dB, referenced to 75 m Sec. Pre-emphasis curve.
4.5 MHz Intercarrier Stability:	± 5 kHz, 0 degrees Celsius to + 50 degrees Celsius.
Total Harmonic Distortion:	1.5% maximum.
Hum and Noise:	-60 dB minimum, referenced to 25 kHz peak deviation.
General
AC Power Input:	115 VAC ± 10%, 60 Hz, 10 watts.
Operating Temperature Range:	0° to 50° Celsius (32° to 122° Fahrenheit), ambient.
Dimensions:	1.75 inches (44 mm) Height x 19 inches (481 mm) Width x 4.0 inches (100 mm) Depth.
Weight:	3.5 lbs. (1.6 kg.).
Connectors:	Video input, Audio Input, monitor and RF output are all type F.

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